a rhombus
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The correct name for a 3D diamond shape is a rhombic dodecahedron. This polyhedron has 12 congruent rhombus-shaped faces and is a type of dodecahedron, which is a polyhedron with 12 faces. The term "diamond" is often used colloquially to describe this shape due to its resemblance to the face of a cut diamond.
a triangle
No, a diamond is not normally cut into a square shape.
A Diamond
Yes, there is polygon that is called a diamond but it is not the same shape as the precious stone.